The roof collapsed above four units on the top floor before firefighters called for a third alarm, Matlow said, adding that as many as 52 firefighters were trying to extinguish the blaze after it was upgraded.

Eight units were heavily damaged and two sustained moderate damage, but 11 might be reoccupied by Sunday evening, according to Matlow

Crews had the fire knocked down at 4:40 a.m. and it was under control at 6:59 a.m., he said.